Concrete product comprising an adaptive prestressing system, and method of locally prestressing a concrete product

A concrete product comprising an adaptive prestressing system, the concrete product comprising:

• a concrete body;
• a composite wire embedded within the concrete body at a predetermined location, the composite wire including:
• anchored end portions, each of the anchored end portions comprising a bonded wire segment comprising a steel wire segment constrained within the concrete body to resist axial motion;
• and
• an activable central portion between the anchored end portions, the activable central portion comprising a shape memory alloy (SMA) wire segment and being axially movable within the concrete body, the SMA wire segment comprising a SMA selected from the group consisting of nickel-titanium alloy, iron-manganese-silicon alloy, an iron-nickel-cobalt-titanium alloy, a copper-zinc-aluminum alloy, and a copper aluminum-nickel-alloy,
• wherein, when heated at or above an austenite transformation temperature, the SMA wire segment contracts and the activable central portion exerts a tensile force on the anchored end portions, thereby applying a compressive prestress within the concrete body at the predetermined location.